what is the formula for chord of contact?
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The formula for chord of contact
Then equation of PQ is known as equation of chord of contact. For general circle, it is x1x + y1y + g(x1 + x) + f(y1 + y) + c = 0. Caution: The equation of a chord of contact and the equation of the tangent on a point of the circle and both given by T = 0.
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